Ash sifter for furnaces



S@Pt- 6", i932- G. ANDERSQN ASH-SIFTER FOR FURNACES 2 Sheets-Sheet l Filed Jan. 15, 1931 W@ uw.. in mw mw mm .Sw

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INVENTOR Gustaf/zaerSU/z BY a ATTORNEY Sept. 6, 1932.

G; ANDERSQN ASH SIFTER FOR FURNACES Filed Jan. 15. 1931 2 Sheets-Sheet 2 lNvENToR G ws'afizde/"so/z BY'LS ATTORNEY- Patented Sept. 6, 1932 i UNITED STATES uUsrAF ANDERSON, onnioHMoNn HILL, NEW Yom:

Asn Fon summons' slate and salvaged coals is a matter that demands the exertion Yof a burdensome display of muscular labor, accompanied usually by the infiltration of dust to the lungs, clothing and premises, rendering such tasks onercus and disagreeable in the extreme. Having these matters in -niind it-i-s an object of the present invention to provide `an ash sifting -device permanently disposed on the bottom wall of a furnace ash pit andso completelyenclosed Aas vto prevent the dispersion of ash and dust-particles in the surrounding atmosphere. Y f Y A-furtlher feature Ais in theprovision of a "closed excavation below the ashlsiftin'g screen accessible to a shovel froma point exterior of the furnace `after the sifting operation has been completed.

Another aim is to produce yan eicient means for vigorouslylagitating the sifter screen from beyond the furnace walls,`in an exceptionally easy manner, each stroke being cushioned and requiring a Aminimum of muscular elfort to operate j These and other advantageous objects which will become apparent as the description progresses, are accomplished bythe novel construction and arrangement of few and simple parts hereinafter .described and illustrated in the accompanying drawings, constituting a material vpart of this disclosure, andfin which Y Figure 1 is a side elevational-view of a conventional Vtype of housev furnace, partially brokenaway to .show the yapplication of `an embodiment .of the invention.I

-50 kFigure `2 is a partial plan, partial trans- `appucauma'inea January "15, 1931. Serin-Nq. 508,908.

verse sectional view taken onlinefjQ-f-Qof Figurehl Ffgure 3 l isa Jragmentary'` sectional view taken on line 3-3 of Figure l' and drawnto an enlargedfscale..` Y .l 55

F'gure dis a sectional view, similar to Fig-v ure l, showing a modification. in construetion using a two part screen: .I

; Figure 5 is a transverse .sectional view takenonline- 4of Figure 1l. 60". Figure 6 is another vertical sectional view Y offa furnace showing the installation of a` further modified type of Screen actuating device. f Y f Figure7 is an enlarged fragmentary View of the same. i l Y Y Referringy in greater detail to the drawings, the numeral l5 designates Vin general 'the levelled ground or foundation on 'which the furnace 16 is disposed, this foundation being ordinarily hard surfaced as by cement.

Thefurnace base '17 is shown as being provided with a front'wall 18 removably bolted in place and having an opening 19 leading to an ash pit chamber V2O. Y

i A door 2l `is hinged to the. front' wall to close the opening .to the chamber, and sur rounding the loweriedge'of the base is an out-V standing flange 22.

Carried by the upper portion of the base isv a grate y23` of anyapproved type and thereabove is a fire box 24 surrounded by the wall of the furnace in which is a fire door 25.

v Below theash pitfZO is an excavation 26 in the-foundation, curved at its rear and sloping 85 upwardly at its front which is extended outward-ly to some distance infront of the fur nace base, and provided with a removable cover plate 27, which upon being withdrawn allows the'entrance of a shovelto remove` accumulations in an obvious manner.

Secured rigidly to the base 17, preferably, at a point opposite the door, is 1a support bracket 28 reaching down into the excavation 26 and having a horizontal arm 29'securedto a block 30 disposed belowf and substantially central yof the ash pit chamber.

Theblock l30 yis further wsupported by a transverse bar 31, its ends being twisted, up-' v ed the inner end of a rod 42 'extendingouts rlc wardly through the front of the furnaceV base wall and provided with a handle `43 conveniently maneuvered in shaking thescreen 38 b repeated reciprocations of the rod.

The stroke of the shaker'rod 42 islimited and cushioned by .a rod slidably mounted in the rearmost spoke or arm 35the pin being encircled on each side of thelug by compression springs 46 held vi'nposition by `nuts 47, these nuts acting as .bumpers withrespect to a rigid loop 49 secured on the support arm 29, thus limiting the shaking movementof theash screen 38. l

In the modification, seen in Figures 4 and 5, the chamber 26 is noteXtended forwardly but rendered accessible for the removal of ashes byreason of the ash screen 38 being made in two sections 38 and 38', the latter, lesser portion being connected by hinges 50 at the opposite sides of the ring 37 A loop v51 is fixed. to theforward element 38 of the screen to be engaged by a poker or similarelement thereby to be raisedinto the broken line position shown in Figure 4.

An'arm 52 pivoted at 53 to an extension 0f the hub34 and in a different plane than the hinges 50, is engageable with the ring element .39 when raised and operates to retain the forward portion of the screen when required, the armhaving an upturned point to Contact automatically with a keeper 54 upon be removed after raising the screen element 38 by a shovel entered through the door 21.

However should it be desiredto have greater clearance for the removal of ashes, the device shown in Figures 6 and 7 may be substituted. Y Y

This arrangement includes the supports carrying at their inner extremities, at the axis of the ash pit, a hub bored to receive a spindle 61 on the, upper end of which is mounted the screen carrying elements as described in Figures 1 and 2.

The spindle 61 is provided near its top and bottom with annular grooves 6 2-63 toreceive a hardenedsphere .64, or likevdetent,

` spring pressed into the groovesas clearly shown, the upper groove 62 being preferably Atheinventiombut it will be understood that changes in the form, arrangements, propor-A tions', sizes 'and details thereof may be made without departing from the general tenor'ga'nd scope of the appended claims.v l Having thus described the invention, what is claimed as new and desired to secureiby' Letters Patent, is :-v e f 1 In combination with. a furnace ash pit, a chamber therebelow, a circular screen disposed in a horizontal plane in the opening between saidpit and chamber, a seriesy of in-reaching brackets `fixed tothe wallof said pit .carrying a pivot mounting for said screen, a plate ring covering the space between the ash pit wall andperipheral edge of said screen, a manually reciprocative bar extending into thejash pit pivoted to the edge ofl said screen to produce semirotational movement, a spring bumper carried by said screen, and means on one of Asaid brackets to limit the movement of saidbumper in either direction. v l y v2. In combination with a furnace'ash pit, a chamber therebelow, a circular screen disposed in a horizontal kplanein the opening between said'pit and chamber, said screen consisting of two membersv respectively front and rear'hingedlyunitedin a plane transverse the ash pit, said, rear member being permanently horizontal and' said front member being foldable vertically upward, manual means for limitedly .oscillatingjsaid screen on a central axis, and means for cushioning the oscillatory movements thus imparted. l3. In combinationv with a furnace ash pit, a chamber therebelow, a'circular screen disposed in a horizontal plane in the opening etween said pit and chamber, a seriesof in-reaching brackets fixed to the wall of said pit carrying a block, a spindle rotatablyY and slidably mounted in said block axiallyof the ash pit, av spoked wheel carried by said spindle on which ysaid screeny isl mounted, means Vforraising said spindle and screen, means for retaining'saidelements when in a raised position, and means for reciprocatively oscillating said screen.

4. In combination with a` furnace ash pit', achamber therebelow a circular screen disposed in a horizontal plane intheopening between said p it and chamber, a series of injosj i :ics

iis

reaching brackets fixed to the wall of said pit carrying a block, a spindle rotatably and slidably mounted in said block axially of the ash pit, a spoked Wheel carried by said spindle on which said screen is mounted, a plate ring circumjacent said screen, a loop set in said screen by Which the screen and spindle may be raised, said spindle having annular grooves near its top and bottom, lo a spring pressed detent carried by said block to engage in either of the mentioned grooves to retain said spindle in its adjusted posi tions, anda manually actuable rod pvotally engaged with the rim of said Wheel to transmit oscillatory movement thereto.

In testimony whereof I affix my signature.

GUSTAF ANDERSON. 

